Roof question on my DIY shed build

[kommon_sense]

I'm currently building a garden shed and I'm about to start the underlayment on the roof. I just realized that when we installed the 7/16" OSB on the roof, that we didn't do the 1/8" spacing between sheets.

This is an 8x12 shed with a lean-to style roof. Roof dimensions are roughly 10' x 13'.

So my question is, do I need to do the 1/8" spacing on such a small roof?

I can climb back up there and cut a groove with a circular saw, but I just don't know if it matters much on something this size.

Thanks for any input.

 

[DaveD]

You are good to go. Dont overthink it. Spacing might, and I say might, be a concern on a big roof where the OSB has got soaked and the edges have soaked up a lot of moisture.

From a practical standpoint, if you wanted the spacing on a BIG roof you would buy sheets that are already pre trimmed to give you the spacing on the length. IE: already pre trimmed at 95-7/8.

 

[rcarmac]

OSB is an engineered product to reduce the amount of expansion and contraction. Typically I have heard OSB can expand as much as 1/32" per linear foot. Since OSB doesn't have a gain, expansion could be from any direction. So with your small size, you are looking at less than 1/2" if it was all focused on a single direction, which wouldn't happen. Long story to say I think your fine. If its like my DIY projects, I bet you have some 1/32" gaps or so between the panels anyway that will help. 1/8" is more important as you get into larger roof areas

 

[Mike Davis]

I like a little more overhang to keep the runoff from the roof away from the bottom of the building. On my shop at the farm the overhang was two feet all around.

 

[kommon_sense]

Thanks for the feedback!

I'm curious about something though. The OSB calls for a fastener every 6 inches on the edge and every 12 inches in the field. With all of those fasteners, I don't see how it really has enough give to expand/contract much.

 

[SubGuy]

It also helps to keep any moisture that may build up (between felt paper and osb) a place to vent off during heating and cooling of the roof. Not a problem on such a small roof. If it was larger it is important to have the space and the connectors to build structural integrity on the roof. So long story short, your good.

 

[Jeff]

+1 to you're good to go.

Did you add drip edging to all 4 edges to shed water. OSB hates water.

 

[junquecol]

You applied your OSB during high humidity, so it's only going to shrink later as humidity drops.

 

[nn4jw]

I don't know about best practices with OSB, but when they built my 24x24 garage last year they didn't leave any gaps that I can see between the OSB sheets and it hasn't been a problem through the past 18 months or so.

 

[kommon_sense]

My schedule got hijacked, so I'm still working on the shed roof. I got the underlayment done and need to do the fascia and drip edge. Still need to source the metal roofing.

Anyone have any recommendations for a local metal roofing supplier. I was looking at www.triadmetalroof.com .